Damages detection in cylindrical metallic specimens by means of statistical baseline models and updated daily temperature profiles

12th International Conference on Damage Assessment of Structures

Villamizar-Mejia, Rodolfo^1 ; Mujica-Delgado, Luis-Eduardo^2 ; Ruiz-Ordóñez, Magda-Liliana^2 ; Camacho-Navarro, Jhonatan^2 ; Moreno-Beltrán, Gustavo^1

Universidad Industrial de Santander (UIS), Escuela de Ingenierías Eléctrica, Electrónica y de Telecomunicaciones (E3T), Bucaramanga, Colombia^1

Universitat Politécnica de Catalunya (UPC) BARCELONATECH, Department of Mathematics, Escola d'Enginyeria de Barcelona Est. (EEBE), Campus Diagonal Besòs, Edifici A, C. Eduard Maristany, 10-14, Barcelona

08019, Spain^2

关键词: Baseline models;    Combined indices;    Daily temperatures;    Experimental test;    Sensor and actuators;    Statistical indices;    Temperature changes;    Temperature profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/842/1/012017/pdf
DOI  :  10.1088/1742-6596/842/1/012017

来源: IOP

【 摘 要 】

In previous works, damage detection of metallic specimens exposed to temperature changes has been achieved by using a statistical baseline model based on Principal Component Analysis (PCA), piezodiagnostics principle and taking into account temperature effect by augmenting the baseline model or by using several baseline models according to the current temperature. In this paper a new approach is presented, where damage detection is based in a new index that combine Q and T2statistical indices with current temperature measurements. Experimental tests were achieved in a carbon-steel pipe of 1m length and 1.5 inches diameter, instrumented with piezodevices acting as actuators or sensors. A PCA baseline model was obtained to a temperature of 21° and then T2and Q statistical indices were obtained for a 24h temperature profile. Also, mass adding at different points of pipe between sensor and actuator was used as damage. By using the combined index the temperature contribution can be separated and a better differentiation of damages respect to undamaged cases can be graphically obtained.